Monitoring physiological parameters based on variations in a...

Details Monitoring physiological parameters based on variations in a... Monitoring physiological parameters based on variations in a...

2006-02-21

2006-02-21

Nasser, Robert L. (Department: 3736)

Surgery

Diagnostic testing

Cardiovascular

C600S483000, C600S500000, C600S507000

Reexamination Certificate

active

07001337

ABSTRACT:
A method and apparatus are disclosed for using photoplethysmography to obtain physiological parameter information related to respiration rate, heart rate, heart rate variability, blood volume variability and/or the autonomic nervous system. In one implementation, the process involves obtaining (2502) a pleth, filtering (2504) the pleth to remove unwanted components, identifying (2506) a signal component of interest, monitoring (2508) blood pressure changes, monitoring (2510) heart rate, and performing (2512) an analysis of the blood pressure signal to the heart rate signal to identify a relationship associated with the component of interest. Based on this relationship, the component of interest may be identified (2514) as relating to the respiration or Mayer Wave. If it is related to the respiration wave (2516), a respiratory parameter such as breathing rate may be determined (2520). Otherwise, a Mayer Wave analysis (2518) may be performed to obtain parameter information related to the autonomic nervous system.

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